А)  Вещество Х в цепи превращений   S→ Х→ H2SO3→ Na2SO3

A) SO     B) CH4    C) SO2    
D) CaC2     


В)  Вещество Х в ряду превращений  Ba  →   BaO    →  Х   →   BaCl2

A)   Ba(OH)2                
B)  BaCO3       
C)  BaSiO3                
D)  BaSO4      

             

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